docs: add footer-links configuration documentation (#1340)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: [email protected] <[email protected]>
Co-authored-by: Devin Logan <[email protected]>

Author: 3 people

fern/products/docs/pages/customization/what-is-docs-yml.mdx

@@ -266,6 +266,78 @@ navbar-links:
   By default, the `rightIcon` for a `filled` button is set to `arrow-right`.
 </ParamField>
 
+## Footer links configuration
+
+Add clickable social media and community links to your documentation site footer to improve discoverability and engagement.
+
+<Note>
+  Footer links provide visual navigation to your social channels. To configure SEO metadata and social media tags at the page or site level, see [metadata configuration](/learn/docs/seo/setting-seo-metadata).
+</Note>
+
+```yaml docs.yml
+footer-links:
+  github: https://github.com/your-org/your-repo
+  slack: https://your-community.slack.com
+  x: https://x.com/yourhandle
+  twitter: https://twitter.com/yourhandle
+  linkedin: https://www.linkedin.com/company/your-company
+  youtube: https://www.youtube.com/@yourchannel
+  instagram: https://www.instagram.com/yourhandle
+  facebook: https://www.facebook.com/yourpage
+  discord: https://discord.gg/yourinvite
+  hackernews: https://news.ycombinator.com/user?id=yourusername
+  medium: https://medium.com/@yourhandle
+  website: https://yourwebsite.com
+```
+
+<ParamField path="footer-links.github" type="string" required={false} toc={true}>
+  URL to your GitHub repository or organization.
+</ParamField>
+
+<ParamField path="footer-links.slack" type="string" required={false} toc={true}>
+  URL to your Slack community or workspace.
+</ParamField>
+
+<ParamField path="footer-links.x" type="string" required={false} toc={true}>
+  URL to your X (formerly Twitter) profile.
+</ParamField>
+
+<ParamField path="footer-links.twitter" type="string" required={false} toc={true}>
+  URL to your Twitter profile. Use `footer-links.x` for the new X branding.
+</ParamField>
+
+<ParamField path="footer-links.linkedin" type="string" required={false} toc={true}>
+  URL to your LinkedIn company page or profile.
+</ParamField>
+
+<ParamField path="footer-links.youtube" type="string" required={false} toc={true}>
+  URL to your YouTube channel.
+</ParamField>
+
+<ParamField path="footer-links.instagram" type="string" required={false} toc={true}>
+  URL to your Instagram profile.
+</ParamField>
+
+<ParamField path="footer-links.facebook" type="string" required={false} toc={true}>
+  URL to your Facebook page.
+</ParamField>
+
+<ParamField path="footer-links.discord" type="string" required={false} toc={true}>
+  URL to your Discord server invite.
+</ParamField>
+
+<ParamField path="footer-links.hackernews" type="string" required={false} toc={true}>
+  URL to your Hacker News profile.
+</ParamField>
+
+<ParamField path="footer-links.medium" type="string" required={false} toc={true}>
+  URL to your Medium publication or profile.
+</ParamField>
+
+<ParamField path="footer-links.website" type="string" required={false} toc={true}>
+  URL to your main website or homepage.
+</ParamField>
+
 ## Background image configuration
 
 ```yaml docs.yml

fern/products/docs/pages/seo/metadata.mdx

@@ -7,6 +7,10 @@ Optimize your documentation's search visibility and social media presence by con
 
 When configuring SEO metadata, ensure your titles and descriptions are unique, descriptive, and relevant to the page content. Keep descriptions between 150-160 characters for optimal display in search results.
 
+<Note>
+    The metadata configurations on this page are for SEO and social tags that aren't visible to users. For visible footer links, see [footer links configuration](/learn/docs/configuration/what-is-docs-yml#footer-links-configuration).
+</Note>
+
 ## Page metadata
 
 Set SEO properties in each page's [frontmatter](/docs/configuration/page-level-settings) to control how individual pages appear in search results and social media shares. Page-level metadata takes precedence over site-wide settings.